Kosudoku: Multiplayer Sudoku

One board. Up to four players. All solving at once. Watch their guesses land in real time and claim each square before they do — first to solve it owns it.

Four players. One Sudoku grid. Everyone solving it at the same time.

Kosudoku is Sudoku as a live race. You and up to three friends get the identical board, and you're all filling it simultaneously — their guesses appear on your screen the moment they make them. Every square belongs to whoever solves it first. Hesitate on a cell you'd worked out, and you'll watch it turn someone else's colour.

That's the whole game: a shared grid, a running scoreboard, and the pressure of knowing three other people are looking at the same empty square you are.

RACE ON ONE BOARD • Up to 4 players on a single shared puzzle, live. • See opponents' attempts land in real time, colour-coded by player. • Claim a square by solving it first — it's yours, and it's gone for everyone else. • Wrong guesses cost you points, so speed alone won't win it.

BUILD A STREAK, HUNT THE BONUS CELLS • Chain correct answers to raise your streak multiplier. • Gold cells double your points. Rainbow cells triple them. • Land a streak on a bonus cell and the score jumps.

PLAY SOLO ANY TIME • Four difficulties, from Easy to Expert. • Chase your own best times and scores. • Every solo game still feeds your league points and rank.

CLIMB THE LEAGUES • Weekly league groups of up to 20 players. • Finish top three to promote — slip and you drop. • Ranks run Bronze through Grandmaster.

PUT SOMETHING ON IT • Wager Quickets on a match. Everyone matches the stake, winner takes the pool. • Earn Quickets from wins, streaks and daily rewards. • Spend them in the store on board skins, themes, fonts and player colours.

PLAY WITH FRIENDS • Add friends, see who's online, challenge them directly. • Schedule a match for later and get a reminder when it's time. • Chat in the lobby and mid-game.

CROSS-PLATFORM Kosudoku is fully cross-platform — challenge any friend and compete in the same live matches, leagues and leaderboards, whatever device they play on.

Free to play, with optional in-app purchases.